Joshua B. Fisher
@jbfisher.bsky.social
260 followers 23 following 44 posts
Associate Professor of Environmental Science & Policy at Chapman University Science Lead at Hydrosat, Inc. Project Scientist at UCLA Former ECOSTRESS Science Lead at NASA JPL Opinions mine
Posts Media Videos Starter Packs
Reposted by Joshua B. Fisher
kalimiddleby.bsky.social
Featured on the cover of @globalchangebio.bsky.social is a thermal image of Elaeocarpus Grandis taken at @jcuofficial.bsky.social Daintree Rainforest Observatory. In this species we find that populations originating from warmer climates have narrower leaves with higher rates of water loss.
Reposted by Joshua B. Fisher
charlottegrossiord.bsky.social
New PhD position in Plant Ecophysiology🌳 Study how atmospheric & soil drought shape tree carbon & water relations at the VPDrought experiment in Switzerland. Start Jan 2026. Apply here: m.refline.ch/273855/1759/... @wslresearch.bsky.social
jbfisher.bsky.social
The Gifford Fire is the largest fire thus far this year in California. Captured by ECOSTRESS.

Data visualized by high-school student Krishiv Jaini
jbfisher.bsky.social
Phoenix just hit the hottest Aug day in recorded history. ECOSTRESS saw it a couple days before with temps of 124F/51C at 9.20AM.

Data visualized by high-school student Kaitlin Cho.
jbfisher.bsky.social
Happening now! Largest fire in France in nearly a hundred years. Captured by ECOSTRESS.

Data visualized by high school student Bill Chen.
jbfisher.bsky.social
Compilation of fires burning in Portugal as captured by ECOSTRESS.

This image was a collaboration from multiple high school students piecing together the individual fires.

Bill Chen Kaitlin Cho Krishiv Jaini Taara Reddy Ray Schaffer Lucas Zaninovich
jbfisher.bsky.social
Sending ❤️ to Portugal, half of which is on fire right now. This fire, outside of Serabigões, captured by ECOSTRESS a few days ago.
jbfisher.bsky.social
Interesting volcanic activity happening at Hawai’i, captured by ECOSTRESS. Volcanic activity here seems to have accelerated anomalously since Dec.

Image captured by 16-year-old Shreyas Chatterjee working with me this summer.
jbfisher.bsky.social
Interestingly, some areas of the burn zone had low evaporative stress, and these areas did not burn. These images were compiled by 16-year-old, Justin Reinman, who lost his school in the fire. Justin is working with me on a detailed analysis of the evaporative stress for the fire.
jbfisher.bsky.social
Progression of Evaporative Stress from ECOSTRESS leading up to the Palisades fire in LA earlier this year. Things start off generally alright, then those winds smacked into LA and fast-dried the veg, which fueled the uncontrollable fires.
jbfisher.bsky.social
One of my students, Bill Chen, was looking at the Airport Fire in SoCal from last year using ECOSTRESS. Interesting to see the topographic variability in the temperatures.
jbfisher.bsky.social
Hydrosat picked up this scorching heatwave sweeping Europe yesterday. Surface temperatures exceeding 67C/150F! It’s great that we can now capture these temps at high resolution globally and with increasing frequency towards daily as we continue to get our constellation online. Stay safe out there!
jbfisher.bsky.social
Another new paper published today using ECOSTRESS again to predict wildfire—this time burn severity—one week before occurrence across New Mexico. This paper also outlines a framework for using machine learning with these data and applications.

www.nature.com/articles/s41...

@drwkid.bsky.social
Assessment of spatial autocorrelation and scalability in fine-scale wildfire random forest prediction models - Scientific Reports
Scientific Reports - Assessment of spatial autocorrelation and scalability in fine-scale wildfire random forest prediction models
www.nature.com
jbfisher.bsky.social
New paper using ECOSTRESS and machine learning that predicted Australia’s black summer fires a week ahead of occurrence, mostly using high resolution water use efficiency and evaporative stress data.

zslpublications.onlinelibrary.wiley.com/doi/full/10....
Reposted by Joshua B. Fisher
theplanetaryguy.bsky.social
Inspired by @jtuttlekeane.bsky.social and @ohdearz.bsky.social, here's what the White House proposed budget cuts to NASA would do to the entirety of the agency's Science Mission Directorate.

Bloodbath is right.
Reposted by Joshua B. Fisher
zacklabe.com
"The Great Wave" of carbon dioxide (CO₂) #ClimateChange #ScienceArt

Graphic produced by robbieandrew.github.io
Graph of carbon dioxide designed as the painting of "The Great Wave off Kanagawa" by Katsushika Hokusai.
jbfisher.bsky.social
My student, Holland Hatch, graduated today, won the top award for our major, and was selected to give the commencement speech. She’s traveled with me to Costa Rica & New Mexico serving key leadership roles. In short, she’s been amazing. I will miss her and wish her the best.

youtu.be/ErEM0vdYk-4
Holland Hatch graduation commencement speech at Chapman University 2025
YouTube video by Josh Fisher
youtu.be
jbfisher.bsky.social
Currently in Costa Rica with a NASA team flying drones over my elevated CO2 sites.

NASA/Milan Loiacono